Patents Represented by Attorney Ramesh Varadaraj

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  • Defoaming of foams utilizing sonication
    Patent number: 6590000
    Abstract: The invention includes a method for defoaming aqueous or non-aqueous foams comprising placing a sonicator probe directly into said foam and thereafter sonicating said foam in pulse mode at a sonication energy of at least about 25 watts/cm2 for a time required to collapse the foam.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: July 8, 2003
    Assignee: ExxonMobil Research and Engineering Company
    Inventor: Ramesh Varadaraj
  • Composition for aqueous viscosification
    Patent number: 6569815
    Abstract: The invention includes a composition of matter for increasing the viscosity of an aqueous fluid and for recovering oil from a subterranean formation. It also includes methods for making and using the composition.
    Type: Grant
    Filed: March 28, 2001
    Date of Patent: May 27, 2003
    Assignee: ExxonMobil Research and Engineering Company
    Inventor: Ramesh Varadaraj
  • Demulsification of water-in-oil emulsions
    Patent number: 6555009
    Abstract: The invention includes a method for demulsification of water-in-oil emulsions.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: April 29, 2003
    Assignee: ExxonMobil Research and Engineering Company
    Inventor: Ramesh Varadaraj
  • Viscosity reduction of oils by sonic treatment
    Patent number: 6544411
    Abstract: The invention describes a method for decreasing the viscosity of crude oils and residuum utilizing a combination of acid and sonic treatment.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: April 8, 2003
    Assignee: ExxonMobile Research and Engineering Co.
    Inventor: Ramesh Varadaraj
  • Heavy oil - solid composition and method for preparing the same
    Patent number: 6524468
    Abstract: The invention includes a compositon of matter comprising a heavy oil having dispersed therein surface modified solid wherein said surface modified solids comprise solids having adsorbed thereon air oxidized polar hydrocarbons from said heavy oil and wherein said surface modified solids have a diameter of about 10 microns or less and a method for preparing the same.
    Type: Grant
    Filed: March 28, 2001
    Date of Patent: February 25, 2003
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Ramesh Varadaraj, James Chi Sung
  • Aromatic sulfonic acid demulsifier for crude oils
    Patent number: 6489368
    Abstract: The invention is directed towards a chemical demulsifier formulation comprising an alkyl aromatic sulfonic acid additive with at least 16 carbon atom alkyl group and at least two 6 carbon-ring aromatic group and a co-additive selected from the group consisting of dipropylene monobutyl ether, isoparaffinic solvent, cycloparaffinic solvent, diethylene glycol monobutyl ether, benzyl alcohol, and mixtures thereof.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: December 3, 2002
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Ramesh Varadaraj, Cornelius Hendrick Brons
  • Aqueous, pumpable fluids from solid carbonaceous materials
    Patent number: 6444711
    Abstract: The invention is a method for forming a solid carbonaceous material into a pumpable fluid by combining the solid with an aqueous treatment solution and then subjecting the mixture to shearing forces. The solid carbonaceous material can be deasphalter unit rock (“DAU rock”), coke, and mixtures of DAU rock and coke. Aqueous treatment solutions contain a water soluble polymer.
    Type: Grant
    Filed: January 5, 2001
    Date of Patent: September 3, 2002
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Ramesh Varadaraj, Cornelius Hendrick Brons, David William Savage